#include <stdio.h>
int Sum(int s,int e)
{
  int result = 0;
  for(int i = s;i <= e ;i ++)
  {
    result+=i;
  }
  return result;
}
int main()
{
  int start = 1;
  int end = 100;
  printf("I will begin");
  int n = Sum(start,end);
  printf("running done,result is :[%d - %d] = %d\n",start,end,n);
  return 0;
}
